22 | © Danfoss | Produced by Danfoss Redan A/S | 2020.02
145X2025
AN33376446555601-000101
14. TROUBLESHOOTING HE
Problem
Possible cause
Solution
Too little or no heat.
Strainer clogged in HS or HE circuit
(radiator circuit).
Clean gate/strainer(s).
The filter in the energy meter on HS
circuit clogged.
Clean the filter (after consulting the HS
plant operator).
Defective differential pressure controller. Replace main controller, TPC.
Sensor defective.
Check the operation of the thermostat –
clean the valve seat if required.
Air pockets in the system.
Vent the installation thoroughly.
Limiting of the return temperature
adjusted too low.
Adjust according to instructions.
Defective radiator valves.
Check – replace.
Uneven heat distribution in building
because of incorrectly set balancing
valves, or because there are no balanc-
ing valves.
Adjust/install balancing valves.
Diameter of pipe to flat station too small
or branch pipe too long.
Check pipe dimensions.
Uneven heat distribution.
Air pockets in the system.
Vent the installation thoroughly.
HS supply temperature too high.
Defective controller. The controller does
not react as it should according to the
instructions.
Call automatic controls manufacturer or
replace the regulator.
Defective sensor on self-acting thermostat. Replace thermostat.
HS supply temperature too low.
Defective controller. The controller does
not react as it should according to the
instructions.
Call in automatic controls manufacturer
or replace controller.
Strainer clogged.
Clean gate/strainer.
Montage- und Betriebsanleitung / Mounting and Operating guide
EvoFlat Reno
